I've never heard of any other benefits other than helping to prevent ash in CP. I do spritz my soaps after pouring and then cover. I get very little ash.
Alcohol (mainly ethanol, not isopropanol) in combination with glycerin and a sugar solution are used in HP to make translucent soap. It's an entirely different and more complicated process though.. Alcohol alone would probably not work and make the soap more drying.
Alcohol (mainly ethanol, not isopropanol) in combination with glycerin and a sugar solution are used in HP to make translucent soap. It's an entirely different and more complicated process though..
What I did once was that I mixed isopropanol and little bit bronze mica in a small spray bottle. Shook it up and sprayed it on top of my cold process soap (but it will work the same in HP, except remove soda ash, since there is no soda ash to remove). It did a good job in making a metallic shine on the top, and most important, it halfway camouflaged my very ugly looking top.